AXP209 datasheet(16/45 Pages) ETC2

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AXP209

Enhanced single Cell Li-Battery and Power System Management IC

3. Input voltage is too high( Overvoltage Protection)( See more details in chapter “ Intelligent

Power Select”

4. Have waited more than 2S(default) when N_OE changes from hight to low

5. Push PEK longer more than OFFLEVEL( Default 6S), and system will cut off all power output

except LDO1( there is no need for an extra RESET key)

Note: With the automatic protection mechanism, AXP209 can protect the whole system by preventing

components suffering from irreversible damage due to system abnormality.

Sleep and wakeup

When the running system needs to enter Sleep mode, REG31H [3] will determine whether one or

several power rails should be disabled or change to other voltage. Wakeup can be trigged by either

PEK signal, or the rising/falling edge of GPIO0, GPIO1, GPIO2, GPIO3 (To be the rising or falling edge,

or both can be programmed by REG90H[7:6], REG92H[7:6], REG93H[7:6], and REG95H[7:6]), with all

power rails resume to default voltage in default power on timing sequence.

NOTE: PEK IRQ(REG42H[1]), GPIO0 INPUT Edge IRQ (REG44H[0]), GPIO1 INPUT Edge IRQ

(REG44H[1]), GPIO2 INPUT Edge IRQ(REG44H[2]), GPIO3 INPUT Edge IRQ (REG44H[3]) should

be enabled to notify the processor to exit Sleep Mode via IRQ PIN.

See control process under sleep and wakeup modes as below:

Confidential

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